Paper machinery



PAPER MACHINERY Filed Sept. 15, 1930 F/g. M)

gmc/Kto@ 53M kul/LM @bm Patented May 17, 1932 UNITE STATES PATENT OFFICE HARRY WRIGHT, JR., OF GI-IILLICOTHE, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO j THE MEAD CORPORATION, OF DAYTON, OHIO, A CORPORATION F OHIO PAPER MACHINERY Application filed September 13, 1939. Serial No. 481,672.

This invention relates to roll scrapers of the type used for scraping the surfaces of paper making rolls or the like.

One object of the invention is the provision of a roll scraper of the character mentioned having a scraping blade, and a finger guard loosely held on the blade so as to protect the fingers of the operator.

Another object of the invention is the proo vision of a scraper having a scraping blade and a pair of finger guard pieces clamped together so as to loosely hold the blade between them, permitting the withdrawal of the blade while protecting the fingers of the Operator against injury from the rolls.

Other objects and advantages of the invention will be apparent from the following description, the appended claims and the accompanying drawings, in Which- Fig. 1 is a plan view of a scraper embodying the present invention; v

Fig. 2 is a side view of the scraper; and

Fig. 3 illustrates the manner in which the scraper may be used.

Referring more particularly to the drawings, in which a preferred embodiment of the invention is illustrated, 10 designates a scraping blade having a scraping edge 11. The blade is preferably a thin rectangular piece of metal and is preferably fiat, as shown. The thickness of the blade may be about oneeighth of an inch or less, the length of the blade about six inches, and its width several inches, as desired. The scraping edge of the blade is to be applied to a rotating roll of a pap-er making machine or the like to remove particles of paper or the like which might adhere to the rolls. Particularly in calendering machines the presence of the particles of paper on the rotating rolls is objectionable, inasmuch as such paper particles or other impurities produce dents in the paper which is pressed down between the rolls that bear on one another with high pressure, marring the finish on the paper. It is therefore desirable that the operator may frequently scrape the surfaces of the rotating rolls to remo-ve any accumulated impurities of this character. This, in the past, has been a rather dangerous operation, inasmuch as a man is apt to permit his fingers to be caught in the nip of the rapidly rotating rolls with consequent serious injury to his hand or arm.

In accordance with the present invention, injury to the fingers or the hand of the operator is prevented, the scraper being provided with a finger guard which is loosely held to the blade. This finger guard, designated generally12in the drawings, preferably embodies two guard sections 13 and 14, of wood or metal, projecting from opposite sides of the scraper blade at a location some distance from the scraping edge and, preferably about four inches or so from the opposite edge, which is adapted to beheld in the hand. Thus the finger guard, as shown in Fig. 3, is in position immediately adjacent the ends of the operators fingers, who holds the blade with his thumb on the underside and his fingers above it, grasping the end of the blade so as to apply the necessary pressure on the scraping edge which is held in engagement with the rotating roll to remove the adhering particles of paper.

The two guard sections 13 and 14, which are shown as semi-circular in shape, are clamped together by suitable screws 16 or the like. The length of these guard sections eX- ceeds the width of the scraping blade, as shown in Fig. 1, and the screws 16 connect the two sections together beyond the side edges of the blade. Between the projecting portions of the Vguard sections are compressible pads or washers 17, preferably 0f rubber, the thickness of these pads being such that the scraping blade is clamped snugly between the guard sections, the lclamping engagement, however, being loose enough to permit the blade to be withdrawn endwise from between the guard sections if even a small force is exerted tending to do so.

In use, the scraper is normally applied to a rotating roll as shown in dotted lines in Fig. 8,-that is, the scraping edge is normally applied to the portion of the roll which is moving away'from the nip and towards the scraping edge so that there will be no danger to the operator'as long as he continuesto to carelessness or inattentiveness or sometimes of necessity, the scraping edge may be applied to that portion of the roll which is moving towards the nip, as shown in full lines in this ligure, and under such conditions it will be quite apparent that if there were no guard on the scraping blade, the blade might be seized in the nip of the rolls, pulling in the lingers of the operator and resulting in serious injury. The guard l2, however, effectively guards against injury to the fingers, because it is large .enough so that it will not pass through the nip of the roll and effectively blocks the fingers away from the nip i`n case the scraping edge is seized by the nip of the rolls and drawn in. As the fingers of the operator are normally immediately adjacent the guard block 12 it will be apparent that the blade may be pulled quickly out of his hand, leaving' his lingers against the finger guard and preventing injury.

The outward extent of the finger guard. away from the plane of the scraping blade is sufliciently large so that the guard cannot pass between two rotating rolls, but on the contrary will be discharged away from the nip of the rolls in case they accidentally engage with the rolls. As shown the total depth of the finger guard is about an inch or so and it is provided on the scraping blade about two inches or so from the scraping edge so that the blade can be applied to the roll practically tangentially for eective scraping action and at the same time providing eective protection for the fingers.

While the form of apparatus herein dcscribed constitutes a preferred embodiment of the invention, itis to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

Vhat is claimed is:

1. A device of the class described comprising a scraping blade, and a finger guard between the .ends of said blade and loosely held thereon.

2. A device of the class described comprising a scraping blade, and a finger guard projecting transversely of the biade a substantial distance towards opposite sides thereof and loosely held on the blade.

3. A device of the class described comprising a flat scraping blade, and a finger guarc slidably mounted between the ends of the blade and projecting a substantial distance towards opposite sides of the blade.

4. A device of the class described comprisa flat scraping blade, a finger guard com-- prising a guard section on each side of the blade between the ends thereof, and means clamping said guard sections together so as to hold the blade loosely therebetween.

5. A device of the class described compris- 44ing a thin metal scraping blade, and a finger guard loosely connected to said' blade and positioned at a distance from an end of' said blade so as to be engaged by the ends of the fingers of the operator when he holds the said end in his hand.

6. A scraper for rotating rolls comprising a thin scraping blade, and a finger guard formed of opposed guard sections provided on opposite sides of the blades, means loosely clamping said guard sections together and to the blade so that the blade may be withdrawn endwise for the protection of the fingers of the operator.

ln testimony whereof I hereto affix my signature.

HARRY WRIGHT, JR. 

